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region behavior
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This implements a passthrough disk driver that translates the read/write
block addresses by a fixed offset. This could form the basis of MBR
partition support if we were to parse the MBR table at boot and create that
OffsetDiskDevice dynamically, rather than seeking to a fixed offset.
This also introduces a dependency in the form of grub. You'll need to have
32-bit grub binaries installed to build the project now.
As a bonus, divorcing Serenity from qemu's kernel loading means we can now
*technically* boot on real hardware. It just... doesn't get very far yet.
If you write the `_disk_image` file to an IDE hard drive and boot it in a
machine that supports all the basic PC hardware, it *will* start loading
the kernel.
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The old bootloader was hilariously complicated, requiring a floppy disk with
the kernel on it, and a hard drive with the file system. This patch removes
the floppy disk from the equation and replaces it with a multiboot header.
This means the kernel can now be booted with qemu-system-i386 -kernel kernel
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This is all pretty rickety but we can now respond to "arping" from the host
while running inside QEMU. Very cool. :^)
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It walks the stack and identifies anything that looks like a kernel symbol.
This could be a lot more sophisticated.
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It's a lot crappier than I remembered it. It's gonna need a lot of work.
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